If a page is likely to be open for editing for some time there is a danger of conflicts - someone else may edit at the same time, and saving your edit will cancel out theirs, or vice versa. The way to avoid that is to make a temporary entry, directly under the language bar, using <nowiki>{{Being_Edited}}</nowiki> which will display

If a page is likely to be open for editing for some time there is a danger of conflicts - someone else may edit at the same time, and saving your edit will cancel out theirs, or vice versa. The way to avoid that is to make a temporary entry, directly under the language bar, using <nowiki>{{Being_Edited}}</nowiki> which will display